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Ubuntu is a computer operating system based on the Debian GNU/Linux distribution and distributed as free and open source software. Ubuntu
is a fast, secure and easy-to-use operating system used by millions of
people around the world. But comparing Ubuntu with Windows is far not
possible. It is because of Ubuntu less compatibility & less software
available for Ubuntu around the web , most of us does not like Ubuntu
as our default OS and want to Uninstall it.

As
explained above the same is the problem with our regular
visitor Zaigham, who wants to uninstall Ubuntu from A Windows Dual-Boot
PC. So here i m with a complete Step by Step guide about How to
Uninstall Ubuntu safely From A Windows Dual-Boot PC.
Everyone who
uses Ubuntu know how to remove Ubuntu when you installed it with wubi.
But sometimes it’s hard to remove (uninstall) Ubuntu when you installed
it in separate partition (without wubi).
Some
people may ask “why not just delete Ubuntu partitions?”. No we can’t do
like this because Ubuntu installs a boot loader called GRUB into the Master Boot Record (MBR),
if you delete Ubuntu partitions all the data will be deleted but not
GRUB! So when your restart your PC, GRUB will look for Ubuntu , when it
does not find Ubuntu it show some error and you cannot even boot into
windows. And even sometime we are not able to Delete the Ubuntu
Partition via Windows Installation Disc. So here I’m going to show you
two ways to safely remove Linux.

Now
you can delete Ubuntu partitions (/, swap etc) using Easeus Partition
Manager or Windows Disk Management or other partition editor.

Restart your PC.

or below is an alternative to Restore MBR

[Alternative] Restore MBR (Using Windows CD/DVD)

Boot from Windows CD/DVD and choose “Repair” when it shows up.

Choose command prompt on the resulting screen and run the following two commands:

bootrec /fixmbr

bootrec /fixboot

XP users need to run the recovery console from Windows XP CD and then type fixmbr when at the command prompt. This will overwrite GRUB with Windows boot loader . So you will see Windows boot loader instead of GRUB.

Delete Linux Partitions

Next
step: delete every Linux partition. That would include everything –
boot, swap, home, whatever way you set up your system, it is time to
delete all Linux partitions. There are a couple of ways to achieve this,
easiest being from within Windows’ Computer Management. You need to:

Log in to an account with administrative privileges.

Right click on My Computer, click ‘Manage’.

Choose ‘Disk Management’ listed under ‘Storage’ and you will see all of your partitions listed there.

Next, you need to identify Linux
partitions. The Linux partitions generally don’t have a file system
listed with them if Windows doesn’t recognize it, so this can serve as a
clue. Other ways can be identifying by size or partition number. You
can use partition managers, these are generally better at identifying
filesystems. Go ahead, delete the partitions, just make sure you delete
the correct ones. Linux is gone and its GRUB, and we had already restore
our Master Boot Record (MBR). So you can easily boot
from your Windows now, and if not then all you need is to just Re
install it using Windows Installation CD/DVD.

Reclaim free space

Restart
now, and you should be able to boot into your Windows installation.
Once there, you should go ahead and reclaim the unpartitioned free space
which was previously occupied by Linux. Doing so is simple and straight
forward:

Fire up Disk Management as before.

Right-click on the unparitioned space, choose new partition or new logical drive.

Specify the size and other options according to your needs and you are done.

The
free space should now be accessible from My Computer like any other
partition. Alternatively, you can create multiple partitions from the
free space or resize existing partitions to suit your needs.You can use
utilities like GParted, Easues Partition Master or any one of the many partition managers to perform such advanced tasks easily.

I hope that the above Tutorial will help you to safely Uninstall Ubuntu Linux From A Windows Dual-Boot PC.